Verification of an Advanced BHA Analysis Model With Downhole Bending Moment Measurements

2005 ◽  
Author(s):  
Michael Neubert ◽  
Gerald Heisig ◽  
Ingo Forstner ◽  
Fadi Mounzer
Keyword(s):  
Bending Moment ◽  
Analysis Model

Random Seismic Response Analysis of Leaning-Type Arch Bridge

2011 ◽  
Vol 378-379 ◽  
pp. 332-336
Author(s):  
Yong He Li ◽  
Ai Rong Liu ◽  
Qi Cai Yu ◽  
Pan Tang ◽  
Fang Jie Cheng
Keyword(s):  
Bending Moment ◽  
Internal Force ◽  
Response Analysis ◽  
Analysis Model ◽  
Element Analysis ◽  
Arch Bridge ◽  
Space Truss ◽  
Out Of Plane ◽  
Plane Bending ◽  
The Impact

With an example of steel pipe concrete leaning-type arch bridge, space truss system Finite Element Analysis model is constructed using the Ruiz-Penzien random seismic vibration power spectrum model. The impact of inclined arch rib angle and the number of cross brace between main and stable arch ribs on the seismic internal force response under lateral random seismic excitation is also studied in this research. Research finding shows, the in-plane bending moment of main arch rib gradually increases with increasing stable arch rib angle and cross brace, whereas the out-of-plane bending moment and axial force display a decreasing trend. In general, this indicates that increasing stable arch rib angle and number of cross brace improves the lateral aseismatic performance of leaning-type arch bridge.

Optimization Analysis and Verification of Negative Moment Reduction for Bridge Structure Based Different Support Pattern

2013 ◽  
Vol 361-363 ◽  
pp. 1297-1301
Author(s):  
Na Li ◽  
Gu Jian Huang ◽  
Bing Shuang Xu
Keyword(s):  
Three Dimensional ◽  
Bending Moment ◽  
Solid Model ◽  
Bridge Structure ◽  
Analysis Model ◽  
Optimization Analysis ◽  
Box Beam ◽  
Negative Moment ◽  
Ansys Workbench ◽  
Optimal Formula

Taking use of SolidWorks and ANSYS Workbench FEM software to establish numerical analysis model and using the node mapping and sectional integral method for the calculation of three-dimensional solid model of bending moment, this paper puts forward a negative moment optimal formula. The optimal formula including parameters λ when took into account the different supporting patterns for continuous box beam bridges. With the comparative analysis of CODE(JTG D62-2004) method and measured data, it draws a conclusion that considering the support patterns on pier top negative moment influence on engineering structural analysis is more appropriate.

Transverse Vibrations of a General Cracked-Rotor Bearing System

1982 ◽  
Vol 104 (2) ◽  
pp. 345-355 ◽  
Author(s):  
T. Inagaki ◽  
H. Kanki ◽  
K. Shiraki
Keyword(s):  
Bending Moment ◽  
Step Function ◽  
Analysis Model ◽  
State Response ◽  
Expansion Technique ◽  
Rotor Bearing ◽  
Small Test ◽  
Unbalance Force ◽  
Numerical Calculation Method ◽  
Bearing System

In this study, the steady state response to the gravity and the unbalance force, and the major natural vibration of a general rotor bearing system with the open or open-close type crack, is analyzed along the iterative numerical calculation method (the transfer matrix method). The open-close type crack is idealized as a step function of the bending moment. The nonlinear equations are linearized by using the Fourier expansion technique, and its solutions are given approximately with the static deflection, the once/rev. vibration, and the twice/rev. vibration. The analyzed calculated method is confirmed by comparing the calculations with the experiments for a small test rotor. The rotor bearing system model in this method is as accurate as the usual numerical rotor dynamic analysis model, and also the required procedures for the calculation are almost the same.

Geometrically Nonlinear Analysis of Long Span Composite Girder Cable-Stayed Bridge with Three Towers under Live Load

2010 ◽  
Vol 34-35 ◽  
pp. 371-375
Author(s):  
Mu Yu Liu ◽  
Feng Wang
Keyword(s):  
Nonlinear Analysis ◽  
Nonlinear Behavior ◽  
Bending Moment ◽  
Live Load ◽  
Valuable Insight ◽  
Geometrically Nonlinear ◽  
Analysis Model ◽  
Geometrically Nonlinear Analysis ◽  
Cable Stayed Bridge ◽  
Composite Girder

A comparison on geometrically nonlinear analysis of composite girder cable-stayed bridge is presented. The spatial nonlinear analysis model named double-girder is established, the geometrically nonlinear behavior of whole bridge is analyzed under dead load plus live load in normal service stage, the nonlinear analysis involves cable sag, large displacement and beam-column, the three nonlinear factors effect on internal force and deformation of side tower, main girder are investigated. The results show that the effect of geometric nonlinearity is small on bending moment and deformation of side tower, and also small on vertical deflection of main girders, but nonlinear effect is large on bending moment of main girders. Results obtained in this research and conclusions made provide valuable insight and guidelines for the design of composite girder cable-stayed bridge with three towers.

scholarly journals Truss-type maintenance devices and corresponding pipeline lifting control strategies

2021 ◽  
Author(s):  
Tian-Feng Zhao ◽  
Qing-Yuan Zhang ◽  
Gui Chu
Keyword(s):  
Control Strategies ◽  
Bending Moment ◽  
Multiple Point ◽  
Analysis Program ◽  
Submarine Pipeline ◽  
Analysis Model ◽  
First Order ◽  
Moment Distribution ◽  
Lifting Equipment ◽  
First Order Differential Equations

AbstractFor new submarine pipeline maintenance lifting equipment, a specialized analysis model is constructed in this study. A pipeline can be divided into the lifted portion and the touch-down portion that lies on the seabed, and each of these portions can be analyzed separately by converting the continuity conditions at the touch-down points to boundary conditions. The typical two-point sequence secant iterative technique is used to obtain the unknown lifted length and determine pipeline lifting configurations. The BVP4C module in MATLAB software is used to solve this multiple-point boundary value problem issued from first-order differential equations. Also, the triple-point lifting mode of truncated maintenance and the two-point lifting mode of online maintenance are discussed. When the lifted heights at truss positions are shown, the lifting deformation, lifting forces, bending moment distribution, and axial force distribution can be analyzed using a dedicated analysis program. Numerical results can then be used to design a lifting strategy to protect the pipeline.

Comparative Analysis of Single Belled Wedge Pile with Conventional Piles under Lateral Load

2012 ◽  
Vol 594-597 ◽  
pp. 50-55 ◽  
Author(s):  
Gang Qiang Kong ◽  
Xian Liang Tan ◽  
Zong Wei Deng ◽  
Zhi Ren Jin
Keyword(s):  
Comparative Analysis ◽  
Skin Friction ◽  
Bending Moment ◽  
Cost Effective ◽  
Analysis Model ◽  
Negative Skin Friction ◽  
Pile Shaft ◽  
Software Models ◽  
Tip Resistance ◽  
Tapered Pile

A new belled wedge pile, which can improves the friction of pile shaft, tip resistance and reduce the influence of negative skin friction, was developed. The analysis model of single belled wedge pile embedded on soft soils was built by p-y curves method via LPILE software, models of conventional belled pile, tapered pile, and uniform section pile with the same volumes were also built for comparative analyze. The performances on load deflection curves, and bending moment distributions for these four pile types were comparative analyzed and discussed. Then the parameter studies of single belled wedge pile are carried out. The results show that belled wedge pile is one of cost-effective piles, which can improve lateral bearing capacities effectively.

scholarly journals Difficulties in the Construction of Subway Tunnel Underpass Project and Research on Ecological Restoration Technology

2021 ◽  
Author(s):  
Yongchao Zhu, Pengbo Cui, Hongshuo Sun
Keyword(s):  
Bending Moment ◽  
Internal Force ◽  
Analysis Model ◽  
Subway Tunnel ◽  
Step Method ◽  
Tunnel Support ◽  
Organization And Management ◽  
Construction Methods ◽  
Geological Conditions ◽  
Dynamic Numerical Simulation

Subway construction is a high-risk construction project, because there are many uncertain factors such as Undercrossing urban hinterland and geological conditions, which lead to the difficulty of organization and management and frequent safety accidents. Therefore, there is an urgent need for effective safety risk analysis model and risk management means to prevent accidents. Aiming at the mechanical problems of surrounding rock and supporting structure of subway tunnel under different construction methods, the dynamic numerical simulation of three pilot tunnel method and upper and lower step method is carried out by using finite element method. The transformation relationship between stress field and displacement field of subway tunnel under different construction procedures is established, and the two construction methods are compared. The test results show that the internal force, axial force and bending moment model of the subway tunnel support structure system established in this paper has a certain guiding significance for the design and safe construction of the subway tunnel.

scholarly journals Analysis of the influence of pile embedded cap depth on horizontal bearing capacity of PHC pipe pile group with cap

2020 ◽  
Vol 198 ◽  
pp. 02010
Author(s):  
Xue Bai ◽  
Guohong Zeng ◽  
Zhaosheng Guo
Keyword(s):  
Power Generation ◽  
Field Experiment ◽  
Bearing Capacity ◽  
Bending Moment ◽  
Pile Group ◽  
Analysis Model ◽  
Pipe Pile ◽  
Pile Cap

This paper is based on the background of the field experiment of the closed renovation project of the coal yard of Shanxi Zhangshan Power Generation Co., Ltd., and the horizontal bearing capacity experiment of the three-pile cap foundation of the in-line PHC pipe piles to be carried out on the site is used as the prototype. ABAQUS establishes an analysis model to analyze the influence of pile embedded cap depth on the horizontal bearing capacity of pile cap foundation. The results show that the maximum bending moment the pile can withstand increases as the depth of the pile embedded cap increases. Therefore, increasing the depth of the embedded cap can increase the horizontal bearing capacity of the three-pill.

Design Application in Suspender Tensile Force of Tied-Arch Bridges Based on Inversion Optimization Method

2012 ◽  
Vol 226-228 ◽  
pp. 1586-1590
Author(s):  
Xue Xian Sun ◽  
Yong Wang ◽  
Feng Chen
Keyword(s):  
Large Scale ◽  
Tensile Force ◽  
Bending Moment ◽  
Optimization Method ◽  
Analysis Model ◽  
Moment Distribution ◽  
Analysis Scheme ◽  
Tensile Forces ◽  
Control Objective ◽  
Arch Bridges

Taking an actual tied-arch bridge project as the background, this thesis has a system static analysis by building up the finite element analysis model with Midas/civil, a large-scale FEM software, then establishes a mathematical optimization model for the back analysis to suspender tensile forces through two optimization schemes. Scheme one takes the reasonable bending moment distribution and minimum moment stain energy as the optimal control objective function to inverse analysis. Scheme two takes the bending moment distribution of dead load as the control objective of inversion optimization analysis, when the difference of the positive and negative absolute value is the minimum in the moment envelope under the load combination, which thinks about live load on the finished state. Through comparing the analysis results, the thesis demonstrates that the inversion optimization method could fulfill the requirement of factual project and be widely used for determining suspender tensile forces of tie-arch bridges.

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